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packages/components/nodes/documentloaders/Unstructured/Unstructured.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| import { | ||
| HiResModelName, | ||
| SkipInferTableTypes, | ||
| UnstructuredLoaderOptions, | ||
| UnstructuredLoaderStrategy | ||
| } from 'langchain/document_loaders/fs/unstructured' | ||
| import { BaseDocumentLoader } from 'langchain/document_loaders/base' | ||
| import { StringWithAutocomplete } from 'langchain/dist/util/types' | ||
| import { Document } from '@langchain/core/documents' | ||
|
|
||
| /** | ||
| * Set the chunking_strategy to chunk text into larger or smaller elements. Defaults to None with optional arg of by_title | ||
| */ | ||
| type ChunkingStrategy = 'None' | 'by_title' | ||
|
|
||
| /** | ||
| * Represents an element returned by the Unstructured API. It has | ||
| * properties for the element type, text content, and metadata. | ||
| */ | ||
| type Element = { | ||
| type: string | ||
| text: string | ||
| // this is purposefully loosely typed | ||
| metadata: { | ||
| [key: string]: unknown | ||
| } | ||
| } | ||
|
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| export class UnstructuredLoader extends BaseDocumentLoader { | ||
| public filePath: string | ||
|
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| private apiUrl = 'https://api.unstructured.io/general/v0/general' | ||
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| private apiKey?: string | ||
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| private strategy: StringWithAutocomplete<UnstructuredLoaderStrategy> = 'hi_res' | ||
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| private encoding?: string | ||
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| private ocrLanguages: Array<string> = [] | ||
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| private coordinates?: boolean | ||
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| private pdfInferTableStructure?: boolean | ||
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| private xmlKeepTags?: boolean | ||
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| private skipInferTableTypes?: Array<StringWithAutocomplete<SkipInferTableTypes>> | ||
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| private hiResModelName?: StringWithAutocomplete<HiResModelName> | ||
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| private includePageBreaks?: boolean | ||
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| private chunkingStrategy?: StringWithAutocomplete<ChunkingStrategy> | ||
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| private multiPageSections?: boolean | ||
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| private combineUnderNChars?: number | ||
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| private newAfterNChars?: number | ||
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| private maxCharacters?: number | ||
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| constructor(optionsOrLegacyFilePath: UnstructuredLoaderOptions) { | ||
| super() | ||
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| const options = optionsOrLegacyFilePath | ||
| this.apiKey = options.apiKey | ||
| this.apiUrl = options.apiUrl ?? this.apiUrl | ||
| this.strategy = options.strategy ?? this.strategy | ||
| this.encoding = options.encoding | ||
| this.ocrLanguages = options.ocrLanguages ?? this.ocrLanguages | ||
| this.coordinates = options.coordinates | ||
| this.pdfInferTableStructure = options.pdfInferTableStructure | ||
| this.xmlKeepTags = options.xmlKeepTags | ||
| this.skipInferTableTypes = options.skipInferTableTypes | ||
| this.hiResModelName = options.hiResModelName | ||
| this.includePageBreaks = options.includePageBreaks | ||
| this.chunkingStrategy = options.chunkingStrategy | ||
| this.multiPageSections = options.multiPageSections | ||
| this.combineUnderNChars = options.combineUnderNChars | ||
| this.newAfterNChars = options.newAfterNChars | ||
| this.maxCharacters = options.maxCharacters | ||
| } | ||
|
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| async _partition(buffer: Buffer, fileName: string): Promise<Element[]> { | ||
| const formData = new FormData() | ||
| formData.append('files', new Blob([buffer]), fileName) | ||
| formData.append('strategy', this.strategy) | ||
| this.ocrLanguages.forEach((language) => { | ||
| formData.append('ocr_languages', language) | ||
| }) | ||
| if (this.encoding) { | ||
| formData.append('encoding', this.encoding) | ||
| } | ||
| if (this.coordinates === true) { | ||
| formData.append('coordinates', 'true') | ||
| } | ||
| if (this.pdfInferTableStructure === true) { | ||
| formData.append('pdf_infer_table_structure', 'true') | ||
| } | ||
| if (this.xmlKeepTags === true) { | ||
| formData.append('xml_keep_tags', 'true') | ||
| } | ||
| if (this.skipInferTableTypes) { | ||
| formData.append('skip_infer_table_types', JSON.stringify(this.skipInferTableTypes)) | ||
| } | ||
| if (this.hiResModelName) { | ||
| formData.append('hi_res_model_name', this.hiResModelName) | ||
| } | ||
| if (this.includePageBreaks) { | ||
| formData.append('include_page_breaks', 'true') | ||
| } | ||
| if (this.chunkingStrategy) { | ||
| formData.append('chunking_strategy', this.chunkingStrategy) | ||
| } | ||
| if (this.multiPageSections !== undefined) { | ||
| formData.append('multipage_sections', this.multiPageSections ? 'true' : 'false') | ||
| } | ||
| if (this.combineUnderNChars !== undefined) { | ||
| formData.append('combine_under_n_chars', String(this.combineUnderNChars)) | ||
| } | ||
| if (this.newAfterNChars !== undefined) { | ||
| formData.append('new_after_n_chars', String(this.newAfterNChars)) | ||
| } | ||
| if (this.maxCharacters !== undefined) { | ||
| formData.append('max_characters', String(this.maxCharacters)) | ||
| } | ||
|
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| const headers = { | ||
| 'UNSTRUCTURED-API-KEY': this.apiKey ?? '' | ||
| } | ||
|
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| const response = await fetch(this.apiUrl, { | ||
| method: 'POST', | ||
| body: formData, | ||
| headers | ||
| }) | ||
|
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| if (!response.ok) { | ||
| throw new Error(`Failed to partition file ${this.filePath} with error ${response.status} and message ${await response.text()}`) | ||
| } | ||
|
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| const elements = await response.json() | ||
| if (!Array.isArray(elements)) { | ||
| throw new Error(`Expected partitioning request to return an array, but got ${elements}`) | ||
| } | ||
| return elements.filter((el) => typeof el.text === 'string') as Element[] | ||
| } | ||
|
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| async loadAndSplitBuffer(buffer: Buffer, fileName: string): Promise<Document[]> { | ||
| const elements = await this._partition(buffer, fileName) | ||
|
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| const documents: Document[] = [] | ||
| for (const element of elements) { | ||
| const { metadata, text } = element | ||
| if (typeof text === 'string') { | ||
| documents.push( | ||
| new Document({ | ||
| pageContent: text, | ||
| metadata: { | ||
| ...metadata, | ||
| category: element.type | ||
| } | ||
| }) | ||
| ) | ||
| } | ||
| } | ||
|
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| return documents | ||
| } | ||
|
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| async load(): Promise<Document[]> { | ||
| return Promise.reject(new Error('load() is not supported for UnstructuredLoader. Use loadAndSplitBuffer() instead.')) | ||
| } | ||
| } |
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